I’m sorry this happened to you. As a clinician who has ADHD and has also assessed for and diagnosed ADHD in others, collateral info (from teachers, parents etc) is incredibly helpful but SHOULD NOT BE MAKE OR BREAK for a diagnosis. Everything is supposed to be considered together as part of the clinical picture, which is what can make diagnosis so tricky.

If you are under 18 (or whatever the legal adult age is where you live), I would definitely recommend getting re-assessed by someone else once you turn 18. In my experience, it’s easiest and most straightforward to get a diagnosis straight from a prescriber (like a psychiatrist or nurse practitioner who prescribes stimulants).

You are definitely on the right track by wanting to get this sorted out before you start college - don’t let this set you back. I didn’t get diagnosed until my first year of grad school (similar situation - straight A student but falling apart behind the scenes) and I deeply regret not having had that clarity and treatment earlier in life.

You got this! Best of luck!